By Christian Jung (English Translation by Regina Wick, Repros: Collection Prinzhorn, Heidelberg) Heidelberg (Germany). Psychiatrist and art historian Hans Prinzhorn (1886-1933) assembled almost 5000 pieces of art between 1919 and 1921 in Heidelberg, which had been made by about 435 psychiatric patients in the German-speaking parts of Europe between 1845 and 1920.